Technical data

Drive functions
7.3 Function modules
Function Manual
224 Function Manual, 06/2012, 6SL3097-4AB10-0BP4
The tolerance window is preset to quarter of the encoder range and can be changed.
CAUTION
The position can only be reproduced if, in the powered-down state, the encoder was moved
through less than half of the range that it can represent. For the standard EQN1325
encoder, this is 2048 revolutions or half a revolution for singleturn encoders.
Note
The ratio stamped on the gear rating plate is often just a rounded-off value (e.g.1:7.34). If, for
a rotary axis, it is not permissible to have any long-term drift, then the actual ratio of the
gearbox teeth must be requested from the gearbox manufacturer.
Multiple drive data sets
Position tracking of the load gear can be activated in multiple drive data sets.
● The load gear is DDS-dependent.
● Load gear position tracking is computed only for the active drive data set and is EDS-
dependent.
● The position tracking memory is only available once for each EDS.
● For position tracking to be continued in different drive data sets under the same
mechanical conditions and with the same encoder data sets, it must be activated
explicitly in all the relevant drive data sets. Possible applications of drive data set
switchover with continuation of position tracking:
– Star/delta switchover
– Different ramp-up times / controller settings
● When the switchover between drive data sets involves a change in gear unit, the position
tracking function starts from the beginning again, i.e. it behaves on switchover as if a
POWER ON had occurred.
● For identical mechanical relationships and the same encoder data set, DDS changeover
has no effect on the calibration status and reference point status.